The average cost to build a porch really depends on what type of porch you want. Costs can range from a couple hundred dollars for a slab of concrete and a rail, to $30,000 or more for a fully enclosed wrap-around porch. Your choice of materials and whether or not you hire a contractor also affect the price.
Study Finds a New Treatment for Tinnitus. Tinnitus is a chronic and incurable condition that affects 5-to-15 percent of Americans. Characterized by phantom sounds such as whistling, clicking, or roaring, this disorder can be debilitating in its worst cases.
I think tinnitus is considered chronic after 3 months and permanent after a year. However as others previously said, it is relatively random. There has been discovered differences in the brains of people with acute and chronic tinnitus, but no-one knows where the border exactly goes.